Chimney



' 4 L. L.BLANCHARD I CH IMNEY.

Filed April 18, 1927- INVENrOR [.cstcr L. Blanchard y v 1 Attdrriay Patented Jan. 22, 1929.

UNITED ST'll'iS 1,700,018 FFICE.

FATENT LESTER L. BLANCHARD, OF PRESQUE ES'LE, ELAINE, SSIGNOR TO GHXMNEY PER- FECTOR COMPANY, LIMITED, 01E OTTAWA, CANADA.

CHIMNEY.

Application filed April 18, 1927. Serial No. 184,629.

A further object of this invention to provide a hollow chimney cap with a dead air chamber, which air is heated by the chimney smoke and gases in a manner to keep the exterior metal surfaces of the cap substantially warm to melt snow and ice which otherwise tends to form around the chimney top with interference to the escape of smoke and gases.

A still further object of the invention is to provide a chimney cap having a depending elongated duct adapted to extend down the chimney flue, which duct is provided with dual side-walls to constitute a depending dead air chamber in conjunction with the cap chamber in a manner that the hot smoke and gases of the lower chimney flue will heat the air in the chamber which hot air will circulate to the extreme top of the cap and fine in a manner to heat the flue to such extent that the smoke and gas leave the stack substantially hot, thus eliminating the moisture which was otherwise created by the mixing of hot gases with the cold air of the upper chimney flue and consequent creation oi carbonic-acid gas and poor combustion.

A further object t(COI1'l]')llSl10(l by the invention is elimination of the carbonic-acid gas in the upper flue which will permit the smoke and furnace gas to leave the chimney without fluctuation and consequently allow the heat to remain in the heating device or furnace with great saving of fuel.

A still further object of the invention is to provide a chimney creosote and foul gas eliminator which is simple in construction, inexpensive to manufacture, eliicient and durable in service, positive in action and a general improvement in the art.

Other objects and many of the attendant advantages will be readily appreciated as the invention becomes better understood after a consideration of the illustrative embodiment of the same and for which purpose such descriptive drawings have been hereto appended, wherein:

Fig. 1 is a perspective view 01": a chimney with the invention attached.

Fig. 2 is a fragmentary sectional view of the chimney and device.

Referring more in detail to the drawings in which similar reference numerals designate the corresponding PZH'LS throughout the several views It will be seen that the chimney stack 6 is provided with a flue 7 down which depends the elongated vertical. duct 8 constituted by the telescoped, dual side walls 9 and 10 substantially spaced apart in fixed relation and sealed near the bottom margins by the base walls 11 in a manner to constitute the dead air chamber 12 and the vertical flue 13 adapted to constitute a section of the chimney flue 7. The interior sidewalls 1O depend substantially below sidewalls 9 in a manner to dire-ct the hot smoke and gases of the lower flue against the base-walls 11 in a manner to heat the air in chamber 12. The exterior sidewalls 9 terminate their vertical course at 14 and are flared outwardly to constitute the integral flange plate 15 adapted to engage the top surface of the chimney stack 6 in a manner to suspend the device.

The interior sidewalls 1O terminate their vertical course at 16 thus constituting the frusto peak of the cap from which they are flared outwardly in a diagonal, depending course to conjoin the remote margins 17 of the integral flangcplate 15 in a manner to constitute the hollow, frustro-tapered cap 18 which further constitutes a section of the (lead air chamber 12.

From the rei'notc margins 17 of the cap 18 depends the vertical flange 19 which is adapted to depend down the exterior margin 01 the chimney stack 6 in a manner to brace the top course of the stack and retain the capdevice in rigid combination and engagement with the chimney.

In operation it will he obviously realized that the hot smoke and gases passing up the lower chimney flue 7 will eilect and heat the air in the lower portion of the chamber 12 which heat will intensity between the metal walls 9 and 10 and circulate upwardly to the uppermost portions of the chamber 12 in a manner to heat the walls of cap 18 and the entire course of the flue 155. 11th such action it will be obvious that snow or the like will be melted and shed from the frustro-tapered cap 18 thus giving a clear vent to the flue and also will the smoke and gases leave the chimney in heated state thus eliminating the moisture previously caused by the mixing of the hot gases with the cold air in the upper chimney fine and consequent creation of carbonic acid gas and creosote within the flue which caused dangerous elements and bad combus tion.

It will be obvious from the foregoing description that this invention is a great improvement in chimney caps and more particularly creosote and foul gas eliminators, and whilst the preferred embodiments have been disclosed, yet it is to be understood that minor details in the construction may be resorted to Within the scope of what is claimed Without departing from the spirit oi" the invention.

What I claim is:

1. A device for insertion in a chimney comprising a hollow cap mounted on and surrounding; the upper end ofthe chimney and a duct depending from said cap, said duct consisting of spaced Wall's providing a dead air chamber surrounding the interior walls of the chimney closed at its lower end and communicating with the said cap.

2. A device for insertion in a chimney comprising a hollow cap mounted on and surrounding the upper end of the chimney, an air chamber composed of spaced Walls depending from said cap and adapted to surround the interior walls of the chimney, said air chamber being closed at its lower end and having communication with said cap.

3. In combination with a. chimney, an air chamber consisting; of spaced walls lining the interior walls of said chimney and joined at their lower ends and a 'trusto-tapered hollow cap mounted on and surrounding the upper end of said chimney having communication with said air chamber.

4. In combination. with a c liimney, an air chan'iber consisting; of spaced walls lining the upper interior walls of said chimney and joined at their lower ends and a frusto-tapered hollow cap formed integral with the upper ends of the walls of the air chamber, said cap being; mounted on and surrounding the upper end of the chimney.

In testimony whereof I affix my signature.

LESTER L. BLANGHARD. 

